<template>
  <div :class="className" :style="{height:height,width:width}"></div>
</template>

<script>
import echarts from 'echarts'
require('echarts/theme/macarons') // echarts theme
import { debounce } from '@/utils'

const animationDuration = 6000

export default {
  props: {
    className: {
      type: String,
      default: 'chart'
    },
    width: {
      type: String,
      default: '100%'
    },
    height: {
      type: String,
      default: '300px'
    },
    autoResize: {
      type: Boolean,
      default: true
    },
    chartData: {
      type: Object
    }
  },
  data() {
    return {
      chart: null,
      demoData: {
        yAxisData: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
        seriesData: [
          { name: 'expected', data: [100, 120, 161, 134, 105, 160, 165] },
          { name: 'actual', data: [120, 82, 91, 154, 162, 140, 145] }
        ]
      }
    }
  },
  mounted() {
    this.initChart()
    if (this.autoResize) {
      this.__resizeHanlder = debounce(() => {
        if (this.chart) {
          this.chart.resize()
        }
      }, 100)
      window.addEventListener('resize', this.__resizeHanlder)
    }

    // 监听侧边栏的变化
    const sidebarElm = document.getElementsByClassName('sidebar-container')[0]
    sidebarElm.addEventListener('transitionend', this.__resizeHanlder)
  },
  beforeDestroy() {
    if (!this.chart) {
      return
    }
    if (this.autoResize) {
      window.removeEventListener('resize', this.__resizeHanlder)
    }

    const sidebarElm = document.getElementsByClassName('sidebar-container')[0]
    sidebarElm.removeEventListener('transitionend', this.__resizeHanlder)

    this.chart.dispose()
    this.chart = null
  },
  watch: {
    chartData: {
      deep: true,
      handler(val) {
        this.setOptions(val)
      }
    }
  },
  methods: {
    initChart() {
      this.chart = echarts.init(this.$el, 'macarons')
      if (this.chartData != null && this.chartData.yAxisData != null) {
        this.setOptions(this.chartData)
      } else {
        this.setOptions(this.demoData)
      }
    },

    setOptions({ yAxisData, seriesData } = {}) {
      var series = []
      for (var i in seriesData) {
        var item = {
          name: 'pageA',
          type: 'bar',
          stack: 'vistors',
          barWidth: '60%',
          data: [],
          animationDuration
        }
        item.name = seriesData[i].name
        item.data = seriesData[i].data
        series.push(item)
      }

      this.chart.setOption({
        tooltip: {
          trigger: 'axis',
          axisPointer: { // 坐标轴指示器，坐标轴触发有效
            type: 'shadow' // 默认为直线，可选为：'line' | 'shadow'
          }
        },
        grid: {
          top: 10,
          left: '2%',
          right: '2%',
          bottom: '3%',
          containLabel: true
        },
        yAxis: [{
          type: 'category',
          data: yAxisData,
          axisTick: {
            alignWithLabel: true
          }
        }],
        xAxis: [{
          type: 'value',
          axisTick: {
            show: false
          }
        }],
        series: series
      })
    }
  }
}
</script>
